Chemical vapor deposition of silica micro- and nanoribbons using step-edge localized water

Michael P. Zach; John T. Newberg; Luiza Sierra; John C. Hemminger; Reginald M. Penner

doi:10.1021/jp034452k

Chemical vapor deposition of silica micro- and nanoribbons using step-edge localized water

Michael P. Zach, John T. Newberg, Luiza Sierra, John C. Hemminger, Reginald M. Penner

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

Amorphous silica (SiO₂) ribbons were prepared by hydrolyzing SiCl₄ at highly oriented pyrolytic graphite (HOPG) surfaces on which water had condensed. Exposure to humid air (>30% relative humidity (RH)) at room temperature caused water to condense selectively at hydrophilic step edges on an otherwise hydrophobic graphite surface. Upon exposure of this surface to SiCl₄ vapor, a reaction with condensed water at step edges caused the formation of SiO₂ according to the reaction SiCl₄ + 2H₂ + SiO₂ + 4HCl. The shape and size of the SiO₂ nanostructures varied with the RH: Below 20% RH, nanoparticles of SiC₂, aligned at step edges, were observed. For RH of 35-50%, continuous nano- and microribbons of SiO₂ were obtained. For higher RH, micron-scale silca particles and ribbons were both observed. At a RH of 35%, silica ribbons as small as 80 nm (width) × 20-40 nm (height) up to 500 μm in length could be prepared. Repetitive dosing of the HOPG surface in the humid environment with SiCl₄ produced nano- and microribbons with a height and width that increased in proportion to square root of the SiCl₄ dose.

Original language	English
Pages (from-to)	5393-5397
Number of pages	5
Journal	Journal of Physical Chemistry B
Volume	107
Issue number	23
DOIs	https://doi.org/10.1021/jp034452k
State	Published - Jun 12 2003
Externally published	Yes

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title = "Chemical vapor deposition of silica micro- and nanoribbons using step-edge localized water",

abstract = "Amorphous silica (SiO2) ribbons were prepared by hydrolyzing SiCl4 at highly oriented pyrolytic graphite (HOPG) surfaces on which water had condensed. Exposure to humid air (>30% relative humidity (RH)) at room temperature caused water to condense selectively at hydrophilic step edges on an otherwise hydrophobic graphite surface. Upon exposure of this surface to SiCl4 vapor, a reaction with condensed water at step edges caused the formation of SiO2 according to the reaction SiCl4 + 2H2 + SiO2 + 4HCl. The shape and size of the SiO2 nanostructures varied with the RH: Below 20% RH, nanoparticles of SiC2, aligned at step edges, were observed. For RH of 35-50%, continuous nano- and microribbons of SiO2 were obtained. For higher RH, micron-scale silca particles and ribbons were both observed. At a RH of 35%, silica ribbons as small as 80 nm (width) × 20-40 nm (height) up to 500 μm in length could be prepared. Repetitive dosing of the HOPG surface in the humid environment with SiCl4 produced nano- and microribbons with a height and width that increased in proportion to square root of the SiCl4 dose.",

author = "Zach, {Michael P.} and Newberg, {John T.} and Luiza Sierra and Hemminger, {John C.} and Penner, {Reginald M.}",

year = "2003",

month = jun,

day = "12",

doi = "10.1021/jp034452k",

language = "English",

volume = "107",

pages = "5393--5397",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Chemical vapor deposition of silica micro- and nanoribbons using step-edge localized water

AU - Zach, Michael P.

AU - Newberg, John T.

AU - Sierra, Luiza

AU - Hemminger, John C.

AU - Penner, Reginald M.

PY - 2003/6/12

Y1 - 2003/6/12

N2 - Amorphous silica (SiO2) ribbons were prepared by hydrolyzing SiCl4 at highly oriented pyrolytic graphite (HOPG) surfaces on which water had condensed. Exposure to humid air (>30% relative humidity (RH)) at room temperature caused water to condense selectively at hydrophilic step edges on an otherwise hydrophobic graphite surface. Upon exposure of this surface to SiCl4 vapor, a reaction with condensed water at step edges caused the formation of SiO2 according to the reaction SiCl4 + 2H2 + SiO2 + 4HCl. The shape and size of the SiO2 nanostructures varied with the RH: Below 20% RH, nanoparticles of SiC2, aligned at step edges, were observed. For RH of 35-50%, continuous nano- and microribbons of SiO2 were obtained. For higher RH, micron-scale silca particles and ribbons were both observed. At a RH of 35%, silica ribbons as small as 80 nm (width) × 20-40 nm (height) up to 500 μm in length could be prepared. Repetitive dosing of the HOPG surface in the humid environment with SiCl4 produced nano- and microribbons with a height and width that increased in proportion to square root of the SiCl4 dose.

AB - Amorphous silica (SiO2) ribbons were prepared by hydrolyzing SiCl4 at highly oriented pyrolytic graphite (HOPG) surfaces on which water had condensed. Exposure to humid air (>30% relative humidity (RH)) at room temperature caused water to condense selectively at hydrophilic step edges on an otherwise hydrophobic graphite surface. Upon exposure of this surface to SiCl4 vapor, a reaction with condensed water at step edges caused the formation of SiO2 according to the reaction SiCl4 + 2H2 + SiO2 + 4HCl. The shape and size of the SiO2 nanostructures varied with the RH: Below 20% RH, nanoparticles of SiC2, aligned at step edges, were observed. For RH of 35-50%, continuous nano- and microribbons of SiO2 were obtained. For higher RH, micron-scale silca particles and ribbons were both observed. At a RH of 35%, silica ribbons as small as 80 nm (width) × 20-40 nm (height) up to 500 μm in length could be prepared. Repetitive dosing of the HOPG surface in the humid environment with SiCl4 produced nano- and microribbons with a height and width that increased in proportion to square root of the SiCl4 dose.

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U2 - 10.1021/jp034452k

DO - 10.1021/jp034452k

M3 - Article

AN - SCOPUS:0037663831

SN - 1520-6106

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SP - 5393

EP - 5397

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 23

ER -

Chemical vapor deposition of silica micro- and nanoribbons using step-edge localized water

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